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What is Weak Head Normal Form?
...es for an expression to be in WHNF:
A constructor: constructor expression_1 expression_2 ...
A built-in function with too few arguments, like (+) 2 or sqrt
A lambda-expression: \x -> expression
In other words, the head of the expression (i.e. the outermost function application) cannot be eval...
Why can't I define a static method in a Java interface?
...
While I understand the arguments, I agree with @Chris_Betti (even for non-generic types): it'd be nice that the code structure ensures that some classes implements a specific static API. Maybe it is possible using a different concept...
– Juh_
...
C++ unordered_map using a custom class type as the key
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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windows service vs scheduled task
... TimeSpan(0,2,0));
}
Source: http://tutorials.csharp-online.net/Creating_a_.NET_Windows_Service%E2%80%94Alternative_1%3a_Use_a_Separate_Thread (Dead Link)
I've been running lots of Windows Services like this for years and it works for me. I still haven't seen a recommended pattern that people ag...
Performing Inserts and Updates with Dapper
...Regex.IsMatch(storedProcedureName,
@"^[\[]{1}[A-Za-z0-9_]+[\]]{1}[\.]{1}[\[]{1}[A-Za-z0-9_]+[\]]{1}$");
}
return Regex.IsMatch(storedProcedureName, @"^[A-Za-z0-9]+[\.]{1}[A-Za-z0-9]+$");
}
/// <summary>
/// This method is us...
HTML5 Pre-resize images before uploading
...le);
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
var MAX_WIDTH = 800;
var MAX_HEIGHT = 600;
var width = img.width;
var height = img.height;
if (width > height) {
if (width > MAX_WIDTH) {
height *= MAX_WIDTH / width;
width = MAX_WIDTH;
}
} else {
if (height >...
node and Error: EMFILE, too many open files
...t:
file: /etc/pam.d/common-session (add to the end)
session required pam_limits.so
file: /etc/security/limits.conf (add to the end, or edit if already exists)
root soft nofile 40000
root hard nofile 100000
restart your nodejs and logout/login from ssh.
this may not work for older NodeJ...
How can I pass a list as a command-line argument with argparse?
...depending on how you want the user interface to behave).
nargs
parser.add_argument('-l','--list', nargs='+', help='<Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234 2345 3456 4567
nargs='+' takes 1 or more arguments, nargs='*' takes zero or more.
append
parser.add_...
Are global variables in PHP considered bad practice? If so, why?
...quests.
Often (always?) you can call member functions in methods like preg_replace_callback() like this:
preg_replace_callback('!pattern!', array($obj, 'method'), $str);
See callbacks for more.
The point is that objects have been bolted onto PHP and in some ways lead to some awkwardness.
Don't...
UICollectionView inside a UITableViewCell — dynamic height?
... -
// MARK: UIView functions
override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {
collectionView.layoutIfNeeded()
let topConstraintCons...